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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Characterization of the degraded microstructures of a platinum aluminide coating
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Characterization of the degraded microstructures of a platinum aluminide coating

机译：铝化铂涂层的降解微观结构的表征

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摘要

The degradation of a platinum modified aluminide (PtAl) coating and a CMSX-4 superalloy substrate were investigated for cyclic and quasi-isothermal heating to 1200 deg C. To accelerate the oxidation of the specimens, the thermally grown oxide (TGO) was removed at 10 h intervals. For up to 80 h of exposure, comparisons of specimens with periodic oxide removal and those without oxide removal were made. Qualitatively, the major changes to the bond coat were associated with phase changes from beta-(Ni,Pt)Al to gamma'-(Ni_3Al) and precipitate coarsening. This evolution was quantified through backscatter scanning electron microcopy and image analysis. With instrumented indentation, the room temperature coating modulus was also measured at 10 h intervals. Additional results include observations of differences in waviness of the bond coat surface for cyclic, quasi-isothermal, and true-isothermal heating, and observations of rafting near the substrate/coating interface. The differences between cyclic and quasi-isothermal heating indicate that stresses associated with cooling and heating significantly alter microstructural evolution.
机译：研究了铂改性的铝化物（PtAl）涂层和CMSX-4高温合金基底在1200摄氏度下的循环和准等温加热的降解情况。为了加速样品的氧化，在120℃下除去了热生长的氧化物（TGO）。间隔10小时。在长达80小时的暴露时间中，对定期去除氧化物的样品和未去除氧化物的样品进行了比较。定性地，键合涂层的主要变化与从β-（Ni，Pt）Al到γ'-（Ni_3Al）的相变和沉淀变粗有关。通过背散射扫描电子显微镜和图像分析定量了这种演变。使用仪器压痕，还应每隔10小时测量一次室温涂层模量。其他结果包括观察到循环，准等温和真等温加热时粘合涂层表面起伏的差异，以及在基材/涂层界面附近漂流的观察。循环和准等温加热之间的差异表明，与冷却和加热相关的应力会显着改变微观结构的演变。

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